Chicago Referencing Style (Notes & Bibliography vs Author-Date)
Chicago referencing is used in subjects where arguments depend on interpretation, historical evidence, or layered engagement with multiple sources rather than simple author–date support. Chicago, unlike Harvard or APA, has two different citation systems. Before starting to reference, students must use the version that their field requires.
In UK universities, Chicago normally appears in the following:
- history
- humanities
- literature
- theology
- cultural studies
In Chicago style, each system structures citations differently. Professors expect students to apply one system consistently across notes, bibliography entries, and repeated citations throughout the assignments.
Core Citation Logic of Chicago Referencing
Chicago uses two recognised citation systems, each suited to different disciplines:
1. Notes & Bibliography (NB)
- Mainly used in humanities writing.
- Citations appear as numbered footnotes or endnotes, allowing sources to be referenced without interrupting analytical discussion.
- Notes can include brief contextual explanations, making this system suitable when interpretation develops across multiple sources rather than single-study evidence.
2. Author–Date
- Primarily used in social sciences.
- Citations appear in brackets within sentences, similar to Harvard or APA style.
- Punctuation, formatting, and bibliography structure follow Chicago-specific rules, not general author–date conventions.
Mastering Chicago’s core logic can help you avoid structural errors. Now, next we’ll look forward to how sources are structured in Chicago.
Citation Structure in Chicago Referencing
In UK humanities assignments, the Notes & Bibliography (NB) system is most commonly used. Citations appear in footnotes with corresponding bibliography entries, ensuring clear source traceability for books, articles, dissertations, theses, and assignments.
Typical NB Citation Patterns:
| Source Type | Footnote Example | Bibliography Example |
| Book |
Mark Elliott, Public Law (Oxford: OUP, 2017), 84. |
Elliott, Mark. Public Law. Oxford: OUP, 2017. |
| Journal article |
Paul Craig, ‘Theory of Judicial Review’, Oxford Journal of Legal Studies 29 (2013): 123. |
Craig, Paul. ‘Theory of Judicial Review’. Oxford Journal of Legal Studies 29 (2013): 123–140. |
| Website |
UK Supreme Court, 'Judgement Summary’, 2022. |
UK Supreme Court. 'Judgement Summary’. 2022. |
| Dissertation / Thesis |
Sarah Khan, Impact of Legal Reform (unpublished PhD thesis, University of Oxford, 2021), 57. |
Khan, Sarah. Impact of Legal Reform. Unpublished PhD thesis. University of Oxford, 2021. |
| Assignment |
John Doe, Human Rights Report (unpublished undergraduate assignment, University College London, 2022), 12. |
Doe, John. Human Rights Report. Unpublished undergraduate assignment. University College London, 2022. |
This structure ensures traceability, preserves hierarchy, and adapts seamlessly across books, articles, dissertations, theses, and assignments.
Using Shortened Notes Correctly in Chicago Style
After the first full footnote citation appears, repeated references use shortened note formats instead of repeating complete publication details. This helps maintain readability while preserving traceability across longer assignments containing frequent source engagement.
A shortened note normally includes:
- author surname
- shortened title
- page number
Markers expect shortened notes to remain consistent with the original full citation because mismatches reduce source traceability across extended discussion.
Common Chicago Referencing Mistakes Students Make
Even minor Chicago errors signal weak citation control, reducing credibility and traceability in academic assignments. Here are some mistakes students make:
Mixing Notes & Bibliography with Author–Date
Combining systems undermines methodological consistency.
Repeating full footnotes
Only the first citation should be full; subsequent references require shortened forms.
Notes and bibliography mismatches
Differences in author, title, or year reduce traceability and verification.
Incorrect punctuation or formatting
Misplaced commas, colons, italics, or quotation marks compromise structural integrity.
Inconsistent title case or italics
Discrepancies between notes and bibliography signal inattentive execution.
Omitting page numbers in quotations
Prevents accurate source location, weakening evidence reliability.
Maintaining strict Chicago discipline ensures authoritative, reliable, and fully traceable referencing in all assignments.
Institutional Variation Across UK Universities
Chicago referencing is globally standardised, yet UK universities may mandate either Notes & Bibliography or Author–Date for specific modules. Departments can specify footnote shortening, bibliography layout, or citation detail in extended coursework. Always prioritise your module handbook, followed by department and university guidance when requirements diverge from general Chicago conventions.